Should we plan first 2 weeks in June or last 2 weeks in July?  (14 days)

What is Sunday like in Japan?  Are tourist places open?  Also which airport is better to fly into with a wheelchair.  Narita or Haneda?  Yes we are staying in Tokyo first.

Can a wheelchair attend a Geisha performance and dinner?  If so and I know this is costly, who do I book?  How does a wheelchair get to Miyajima?